Insert whitespace to avoid ident concatenation in suggestion

[lowr]

This PR tweaks the suggestion of removing misplaced parentheses around trait bounds so as to avoid concatenating two identifiers. Although subtle, this should make outputs less surprising especially when applying the MachineApplicable suggestions automatically.

[rustbot]

r? @wesleywiser

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[Noratrieb]

For reference, here's the current broken suggestion:

error: incorrect braces around trait bounds
 --> src/lib.rs:1:25
  |
1 | fn foo2_no_space(_: &dyn(Drop + AsRef<str>)) {}
  |                         ^                 ^
  |
help: remove the parentheses
  |
1 - fn foo2_no_space(_: &dyn(Drop + AsRef<str>)) {}
1 + fn foo2_no_space(_: &dynDrop + AsRef<str>) {}
  |

[cjgillot]

Thanks for the PR @lowr. Could you please rebase atop current master? I'll approve it.

[lowr]

@cjgillot Done!

[cjgillot]

@bors r+ rollup

[bors]

📌 Commit 807ebac has been approved by cjgillot

It is now in the queue for this repository.